Public bug reported:
I have an ubuntu server 16.04.3 running 4.4.0-98-generic. It randomly
hangs and requires a hard power cycle. I have managed to capture the
following Kernel Oops from the log but I unsure what the cause is.
Nov 17 15:07:47 server1 kernel: [39934.913759] BUG: unable to handle kernel
NULL pointer dereference at (null)
Nov 17 15:07:47 server1 kernel: [39934.913767] IP: [<ffffffff814fa1e5>]
tty_poll+0x55/0x90
Nov 17 15:07:47 server1 kernel: [39934.913775] PGD 7197ed067 PUD 6d7040067 PMD
0
Nov 17 15:07:47 server1 kernel: [39934.913781] Oops: 0000 [#1] SMP
Nov 17 15:07:47 server1 kernel: [39934.913785] Modules linked in: ipmi_si
pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_multiport
mpt3sas raid_class scsi_transport_sas mptctl mptbase ip_gre ip_tunnel gre
dell_rbu ipt_REJECT nf_reject_ipv4 xt_tcpudp xt_iprange xt_conntrack
iptable_filter iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4
nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables binfmt_misc joydev
input_leds ipmi_ssif ipmi_devintf hid_generic gpio_ich usbhid dcdbas hid
intel_powerclamp kvm_intel kvm irqbypass i7core_edac edac_core lpc_ich shpchp
ipmi_msghandler 8250_fintek mac_hid acpi_power_meter coretemp parport_pc ppdev
sunrpc lp parport autofs4 bnx2 megaraid_sas wmi fjes [last unloaded: ipmi_si]
Nov 17 15:07:47 server1 kernel: [39934.913819] CPU: 0 PID: 22392 Comm: telnet
Tainted: G OE 4.4.0-98-generic #121-Ubuntu
Nov 17 15:07:47 server1 kernel: [39934.913821] Hardware name: Dell Inc.
PowerEdge R310/05XKKK, BIOS 1.12.0 09/06/2013
Nov 17 15:07:47 server1 kernel: [39934.913822] task: ffff8808140fa640 ti:
ffff8806d16c0000 task.ti: ffff8806d16c0000
Nov 17 15:07:47 server1 kernel: [39934.913823] RIP: 0010:[<ffffffff814fa1e5>]
[<ffffffff814fa1e5>] tty_poll+0x55/0x90
Nov 17 15:07:47 server1 kernel: [39934.913826] RSP: 0018:ffff8806d16c3978
EFLAGS: 00010246
Nov 17 15:07:47 server1 kernel: [39934.913827] RAX: 0000000000000000 RBX:
ffff88071f498700 RCX: 0000000000000009
Nov 17 15:07:47 server1 kernel: [39934.913828] RDX: 0000000080000000 RSI:
0000000000000000 RDI: ffff88071943ac28
Nov 17 15:07:47 server1 kernel: [39934.913829] RBP: ffff8806d16c39a0 R08:
ffff88071f498700 R09: ffff88071f498700
Nov 17 15:07:47 server1 kernel: [39934.913830] R10: 00000001009732b3 R11:
0000000000000000 R12: ffff88071943ac00
Nov 17 15:07:47 server1 kernel: [39934.913831] R13: 0000000000000000 R14:
ffff8806d16c3aa0 R15: 0000000000000000
Nov 17 15:07:47 server1 kernel: [39934.913832] FS: 00007f2d745ec740(0000)
GS:ffff88081ee00000(0000) knlGS:0000000000000000
Nov 17 15:07:47 server1 kernel: [39934.913834] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Nov 17 15:07:47 server1 kernel: [39934.913835] CR2: 0000000000000000 CR3:
00000007b3e70000 CR4: 00000000000026f0
Nov 17 15:07:47 server1 kernel: [39934.913836] Stack:
Nov 17 15:07:47 server1 kernel: [39934.913837] 0000000000000009
0000000000000040 0000000000000000 0000000000000001
Nov 17 15:07:47 server1 kernel: [39934.913838] 0000000000000004
ffff8806d16c3d48 ffffffff81225873 ffff880814379400
Nov 17 15:07:47 server1 kernel: [39934.913840] ffff8806d16c4000
0000000000000000 0000000000000000 ffff8808140fa640
Nov 17 15:07:47 server1 kernel: [39934.913842] Call Trace:
Nov 17 15:07:47 server1 kernel: [39934.913846] [<ffffffff81225873>]
do_select+0x383/0x810
Nov 17 15:07:47 server1 kernel: [39934.913850] [<ffffffff8173b086>] ?
__dev_queue_xmit+0x286/0x590
Nov 17 15:07:47 server1 kernel: [39934.913852] [<ffffffff812252c0>] ?
poll_select_copy_remaining+0x140/0x140
Nov 17 15:07:47 server1 kernel: [39934.913853] [<ffffffff812252c0>] ?
poll_select_copy_remaining+0x140/0x140
Nov 17 15:07:47 server1 kernel: [39934.913855] [<ffffffff812252c0>] ?
poll_select_copy_remaining+0x140/0x140
Nov 17 15:07:47 server1 kernel: [39934.913858] [<ffffffff810b92da>] ?
enqueue_task_fair+0xaa/0x8b0
Nov 17 15:07:47 server1 kernel: [39934.913861] [<ffffffff81037ef9>] ?
sched_clock+0x9/0x10
Nov 17 15:07:47 server1 kernel: [39934.913864] [<ffffffff810b1d2f>] ?
sched_clock_cpu+0x8f/0xa0
Nov 17 15:07:47 server1 kernel: [39934.913866] [<ffffffff810ab5f4>] ?
check_preempt_curr+0x54/0x90
Nov 17 15:07:47 server1 kernel: [39934.913868] [<ffffffff810ab649>] ?
ttwu_do_wakeup+0x19/0xe0
Nov 17 15:07:47 server1 kernel: [39934.913869] [<ffffffff810ab7ad>] ?
ttwu_do_activate.constprop.90+0x5d/0x70
Nov 17 15:07:47 server1 kernel: [39934.913871] [<ffffffff810ac1f9>] ?
try_to_wake_up+0x49/0x3f0
Nov 17 15:07:47 server1 kernel: [39934.913872] [<ffffffff810ac5b5>] ?
wake_up_process+0x15/0x20
Nov 17 15:07:47 server1 kernel: [39934.913875] [<ffffffff81098671>] ?
insert_work+0x81/0xc0
Nov 17 15:07:47 server1 kernel: [39934.913877] [<ffffffff81225ecf>]
core_sys_select+0x1cf/0x2f0
Nov 17 15:07:47 server1 kernel: [39934.913880] [<ffffffff810c3dd4>] ?
__wake_up+0x44/0x50
Nov 17 15:07:47 server1 kernel: [39934.913883] [<ffffffff814f8251>] ?
tty_write_unlock+0x31/0x40
Nov 17 15:07:47 server1 kernel: [39934.913885] [<ffffffff81502306>] ?
tty_ldisc_deref+0x16/0x20
Nov 17 15:07:47 server1 kernel: [39934.913887] [<ffffffff814fe080>] ?
n_tty_open+0xe0/0xe0
Nov 17 15:07:47 server1 kernel: [39934.913888] [<ffffffff812260aa>]
SyS_select+0xba/0x110
Nov 17 15:07:47 server1 kernel: [39934.913892] [<ffffffff818446b2>]
entry_SYSCALL_64_fastpath+0x16/0x71
Nov 17 15:07:47 server1 kernel: [39934.913893] Code: 45 31 ed 4c 8b 20 4c 89 e7
e8 c8 f8 ff ff 85 c0 74 0e 5b 44 89 e8 41 5c 41 5d 41 5e 41 5f 5d c3 4c 89 e7
e8 be 80 00 00 49 89 c7 <48> 8b 00 48 8b 40 60 48 85 c0 74 0e 4c 89 f2 48 89 de
4c 89 e7
Nov 17 15:07:47 server1 kernel: [39934.913912] RIP [<ffffffff814fa1e5>]
tty_poll+0x55/0x90
Nov 17 15:07:47 server1 kernel: [39934.913913] RSP <ffff8806d16c3978>
Nov 17 15:07:47 server1 kernel: [39934.913914] CR2: 0000000000000000
Nov 17 15:07:47 server1 kernel: [39934.913916] ---[ end trace f4b3729a417c4ec5
]---
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: xenial
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https://bugs.launchpad.net/bugs/1732945
Title:
Kernel Oops - unable to handle kernel NULL pointer dereference at
(null); tty_poll+0x55/0x90
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